Free atts off actually works

addon.json

@@ -1,16 +1,9 @@
 {
-    "title": "ARC9",
-    "description": "",
-    "type": "weapon",
-    "tags": [
-        "roleplay",
-        "realism"
-    ],
-    "ignore": [
-        ".git/*",
-        "README.md",
-        ".py/*",
-        ".blend/*",
-        ".pdn/*"
-    ]
-}
+	"title": "ARC9 Weapon Base",
+	"type": "weapon",
+	"tags": 
+	[
+		"roleplay",
+		"realism"
+	]
+}

lua/weapons/arc9_base/sh_net.lua

@@ -51,7 +51,7 @@ function SWEP:CountAttsInTree(tree)
 
     local count = {}
 
-    for _, i in ipairs(flattree) do
+    for _, i in pairs(flattree[1]) do
         if i.Installed then
             local att = i.Installed
             count[att] = (count[att] or 0) + 1
@@ -72,6 +72,7 @@ function SWEP:ReceiveWeapon()
 
     if SERVER then
         if !self:ValidateInventoryForNewTree(tbl) then
+            self:SendWeapon()
             return
         end
     end

lua/weapons/arc9_base/sh_subatts.lua

@@ -214,7 +214,7 @@ function SWEP:ValidateInventoryForNewTree(tree)
 
     local currcount = self:CountAttsInTree(self.Attachments)
 
-    for att, attc in ipairs(count) do
+    for att, attc in pairs(count) do
         local atttbl = ARC9.GetAttTable(att)
 
         if atttbl.Free then continue end